8 pthread_barrier_t barrier;
11 static void * thread_doit(void *unused)
13 if(DEBUG) printf("Thread %lu: Waiting at barrier\n", (unsigned long)pthread_self());
14 pthread_barrier_wait(&barrier);
15 if(DEBUG) printf("Thread %lu: Passed the barrier\n", (unsigned long)pthread_self());
19 int main(int argc, char* argv[]) {
21 printf("Usage: %s THREAD_NUM DEBUG_FLAG\n", argv[0]);
25 THREAD_NUM = atoi(argv[1]);
26 DEBUG = atoi(argv[2]);
28 thread = (pthread_t*) malloc(THREAD_NUM * sizeof(pthread_t));
30 pthread_barrier_init(&barrier, NULL, THREAD_NUM);
31 for(int i = 0; i < THREAD_NUM; i++) {
32 pthread_create(&thread[i], NULL, &thread_doit, NULL);
35 pthread_barrier_wait(&barrier);
37 for(int i = 0; i < THREAD_NUM; i++) {
38 pthread_join(thread[i], NULL);